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- #include<iostream>
- using namespace std;
- int main()
- {
- int flips=0,rflips=0;
- bool v[20],r[20];
- for(int i=0;i<20;i++)
- {
- scanf("%b",&v[i]);
- r[i]=v[i];
- }
- for(int i=0;i<20;i++)
- {
- if(!v[i])
- continue;
- if(i+2<20)
- {
- v[i]=0;v[i+1]=!v[i+1];v[i+2]=!v[i+2];
- flips++;
- }
- else if(i+1<20)
- {
- v[i]=0;
- v[i+1]=!v[i+1];
- flips++;
- }
- }
- for(int i=19;i>=0;i--)
- {
- if(!r[i])
- continue;
- if(i-2>=0)
- {
- r[i]=0;r[i-1]=!r[i-1];r[i-2]=!r[i-2];
- rflips++;
- }
- else if(i-1>=0)
- {
- r[i]=0;r[i-1]=!r[i-1];
- rflips++;
- }
- }
- printf("%d",min(flips,rflips));
- /*for(int i=0;i<20;i++)
- cout<<v[i]<<" ";*/
- }
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